Kevin McKidd promises 'Grey's' tension

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Kevin McKidd has revealed that Owen and Cristina will face an unexpected problem on Grey's Anatomy.

The duo, who got married at the beginning of the season, had a disagreement about whether or not to have children in the last episode.

McKidd has now told E! Online that the decision about babies won't be the biggest problem for the couple.

"[The baby issue] gets put on the backburner," he said. "I think it's something they both realize is a hot potato subject for each other. They really do love each other, so I think they want to enjoy their honeymoon period, as it were, for as long as they can."

However, McKidd added: "There's an added complication to the mix between Owen and Cristina that comes from left field in the latter part of the season as well, that isn't connected to babies. A work-related issue comes up that adds tension again to their otherwise happy existence. There's something else that comes along that's a problem to them."